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Stone work Scaling

Am about to venture into the land of renovation, and having plenty practice at DIY am not too daunted, yet..... Biggest problem is what to do about scaling on the external stonework. The house is 120 years old and in a seaside town.

Do you mean lime scale? White, powdery, non-water-soluble dusty-looking scale? That is also called efflorescence. Google may be your friend. I think you are going to reach for some sort of acid. Good luck.